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    <p>通过索引可以访问数组中的元素。</p>
    <p>语法：数组名[索引]</p>
    <script>
        let a = ['a','b','c','d'];

        console.log("a[1] = ",a[1]);

        a[2] = '奉先';
        console.log("a[2] = ",a[2]);
    </script>
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